ACPI: processor: thermal: Update CPU cooling devices on cpufreq policy changes

When a cpufreq policy appears or goes away, the CPU cooling devices for
the CPUs covered by that policy need to be updated so that the new
processor_get_max_state() value is stored as max_state and the
statistics in sysfs are rearranged for each of them.

Do that accordingly in acpi_thermal_cpufreq_init() and
acpi_thermal_cpufreq_exit().

Fixes: a365105c685c("thermal: sysfs: Reuse cdev->max_state")
Reported-by: Wang, Quanxian <quanxian.wang@intel.com>
Link: https://lore.kernel.org/linux-pm/53ec1f06f61c984100868926f282647e57ecfb2d.camel@intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>

diff --git a/drivers/acpi/processor_thermal.c b/drivers/acpi/processor_thermal.c
index e534fd4..b7c6287 100644 (file)
--- a/drivers/acpi/processor_thermal.c
+++ b/drivers/acpi/processor_thermal.c
@@ -140,9 +140,13 @@ void acpi_thermal_cpufreq_init(struct cpufreq_policy *policy)
                ret = freq_qos_add_request(&policy->constraints,
                                           &pr->thermal_req,
                                           FREQ_QOS_MAX, INT_MAX);
-               if (ret < 0)
+               if (ret < 0) {
                        pr_err("Failed to add freq constraint for CPU%d (%d)\n",
                               cpu, ret);
+                       continue;
+               }
+
+               thermal_cooling_device_update(pr->cdev);
        }
 }
 
@@ -153,8 +157,12 @@ void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy)
        for_each_cpu(cpu, policy->related_cpus) {
                struct acpi_processor *pr = per_cpu(processors, cpu);
 
-               if (pr)
-                       freq_qos_remove_request(&pr->thermal_req);
+               if (!pr)
+                       continue;
+
+               freq_qos_remove_request(&pr->thermal_req);
+
+               thermal_cooling_device_update(pr->cdev);
        }
 }
 #else                          /* ! CONFIG_CPU_FREQ */